Specify that Atom is under MIT

https://atom.io/faq

> Is Atom open source?
> Yes. Atom is MIT licensed and the source is freely available from the
> https://github.com/atom/atom repository.
>
> All core Atom packages provided by GitHub are also available under the
> MIT license.
Specify that Atlantis is gratis
Specify that Atext is commercial software
Specify that Asepsis is under 3-clause BSD

https://github.com/binaryage/asepsis/blob/master/license.txt
Add BoinxTV.app v1.9.9-17091
Merge pull request #6645 from yegortimoschenko/specify-more-licenses

Specify more licenses (letter A)
convert `link` to `app` in bleep.rb
convert `link` to `artifact` in dwarf-fortress.rb
convert `link` to `app` in ip-in-menu-bar.rb
Merge pull request #6648 from rolandwalker/link_to_app_or_artifact

convert old-style `link` stanza to `app` or `artifact` in 3 Casks
Merge pull request #6638 from yegortimoschenko/not-tetris

Add Not Tetris 2 cask
Add Vagrant Bar.app v1.13

Taskbar utility for monitoring and managing vagrant VMs.
Add Audiobook Builder.app latest

Fix version in Audiobook Builder.app Cask
Add Bookends.app latest

Fix license in Bookends.app Cask
Merge pull request #6643 from roscoe/audiobook-builder

Add Audiobook Builder.app latest
Merge pull request #6647 from roscoe/bookends

Add Bookends.app latest
Merge pull request #6649 from codekitchen/vagrant-bar

Add Vagrant Bar.app v1.13
Merge pull request #6646 from roscoe/boinxtv

Add BoinxTV.app v1.9.9-17091
Merge pull request #6642 from mAAdhaTTah/airfile

Add Airfile
Merge pull request #6640 from yegortimoschenko/leech

Add Leech cask